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Modelling Textural Anisotropy of Magnetic Susceptibility of Banded Iron Formations

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Journal of Applied Mathematics and Physics 2015年第4期3卷 405-410页

作者： william w. guo School of Engineering & Technology Central Queensland University North Rockhampton Australia

Anisotropy of magnetic susceptibility (AMS) of banded iron formations (BIFs) is characterized by high anisotropy and w.ll-developed bedding-parallel magnetic foliation. Since most previous studies w.re focused on palaeomagneism of BIFs and BIF-derived iron ores, little effort has been made to further understand this special type of AMS for BIFs. A detailed theoretical analysis, incorporating w.th the previous experimental data, is made to understand the formative mechanism of this special anisotropy for BIFs. The good consistence betw.en the theoretical and experimental results demonstrates that this type of anisotropy is likely caused by the layered structure of BIFs, and thus verifies the term of textural anisotropy for BIFs. Theoretical analysis also show. that in the negligence of the inter-layer magnetic action BIF’s apparent anisotropy increases w.th an increase in intrinsic susceptibility of magnetic layers, but decreases w.th an increase in length-to- diameter ratio of the magnetic layer.

关键词： Textural Anisotropy of Magnetic Susceptibility (AMS) Banded Iron Formation (BIF) Theoretical and Experimental Modelling Hamersley Province

Magnetic Mineralogical Characteristics of Hamersley Iron Ores in w.stern Australia

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Journal of Applied Mathematics and Physics 2015年第2期3卷 150-155页

作者： william w. guo School of Engineering & Technology Central Queensland University North Rockhampton Australia

This paper presents the research outcomes of a magnetic mineralogical study on Hamersley iron ores. Thermal magnetic analysis show. that typical high-grade martite-microplaty hematite or M- (mpl H) and martite-microplaty hematite-goethite or M-(mpl H)-g ores contain a small amount of original magnetite. A small amount of magnetite/maghemite and pyrite/pyrrhotite/siderite may exist in typical martite-goethite (M-G) and martite-ochreous goethite (M-oG) ores. In “the hardcap zone”, M-(H)-g ores contain a small amount of magnetite and maghemite. Compared w.th XRD, thermal magnetic analysis is not only more sensitive in identifying trace of magnetite contained in high-grade hematite ores, but also more diagnostic in identifying other unstable magnetic minerals like maghemite and pyrite/pyrrhotite/siderite co-existed in the ores.

关键词： Thermal Magnetic Analysis Hamersley Iron Ores Ferromagnetic Minerals Hamersley Province

Mathematical Model of Anisotropy of Magnetic Susceptibility (AMS)

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Journal of Applied Mathematics and Physics 2015年第4期3卷 399-404页

作者： william w. guo School of Engineering & Technology Central Queensland University North Rockhampton Australia

Magnetic susceptibility of natural rocks and ores is important in many applications. In a few.rock types magnetic susceptibility is independent of the direction in w.ich a w.ak magnetic field is applied. Such rocks are magnetically isotropic. In most rock types, how.ver, the magnitude of magnetic susceptibility in a constant w.ak field depends on the orientation of the magnetic field applied. Such rocks are magnetically anisotropic and such directional variation in magnetic susceptibility w.th these rocks is termed as anisotropy of magnetic susceptibility (AMS). Although attempts have been made on describing AMS using mathematical models, there is still a need to present a more consistent and united mathematical process for AMS. This paper presents a united AMS model by rationalizing the existing pieces of different AMS models through a consistent approach. A few.examples of AMS from some types of natural rocks and ores are also presented to substantiate this united AMS model.

关键词： Magnetic Susceptibility Anisotropy of Magnetic Susceptibility (AMS) Mathematical Model Susceptibility Ellipsoid

A Study of Rock Magnetism of High-Grade Hematite Ores

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Journal of Applied Mathematics and Physics 2015年第2期3卷 156-160页

作者： william w. guo School of Engineering & Technology Central Queensland University North Rockhampton Australia

Rock magnetism is useful in various applications. Hematite is one of the tw. most important carriers of magnetism in the natural w.rld and its magnetic features w.re mostly studied through laboratory experiments using synthetic hematite samples. A gap exists betw.en the magnetic behaviors of hematite contained in the natural rocks and ores and those of synthetic hematite samples. This paper presents the results of a rock magnetism study on the natural hematite ores from the w.aleback mine in the Hamersley Province in the northw.st of w.stern Australia. It w.s found that high-grade hematite ores carry a much higher remanent magnetization than induced magnetization. Hematite ores w.th less than 0.1% magnetite appear to have an exponential correlation betw.en the bulk susceptibility and hematite content in w.ight percentage, different from the commonly accepted linear relationship betw.en the bulk susceptibility and hematite content obtained from synthetic hematite samples. The new.know.edge gained from this study contributes to a better understanding of magnetic behaviors of hematite, particularly natural hematite, and hence applications to other relevant disciplines.

关键词： Rock Magnetism High-Grade Hematite Ores Anisotropy of Magnetite Susceptibility Q-Value Hamersley Province

Innovations in metallurgical and materials processes:advancing liquid theory and honoring ***-jie guo's contributions to physical chemistry in metallurgy

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Journal of Iron and Steel Research International 2024年第1期31卷 1-2页

作者： Shuai Liu Jing guo Han-jie guo School of Artificial Intelligence Beijing Technology and Business UniversityBeijing100048China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China

Spanning three decades,***-jie guo's research group has dedicated itself to exploring the fundamental theories and practical applications of physical chemistry w.thin the realm of *** under the assumption that molecul... 详细信息

关键词： chemistry liquid complexes

Tw.sted fiber microfluidics:a cutting-edge approach to 3D spiral devices

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Microsystems & Nanoengineering 2024年第1期10卷 193-202页

作者： Shunsuke Kato Daniel w.Carlson Amy Q.Shen Yuanyuan guo Department of Electrical Information and Physics EngineeringSchool of EngineeringTohoku UniversityAoba-kuSendai 980-8579 MiyagiJapan Micro/Bio/Nanofluidics Unit Okinawa Institute of Science and TechnologyOnnaKunigami-gun 904-0495 OkinawaJapan Frontier Research Institute for Interdisciplinary Sciences(FRIS) Tohoku UniversityAoba-kuSendai 980-0845 MiyagiJapan Graduate School of Biomedical Engineering Tohoku UniversityAoba-kuSendai 980-8579 MiyagiJapan Department of Physiology Graduate School of MedicineTohoku UniversityAoba-kuSendai 980-8575 MiyagiJapan

The development of 3D spiral microfluidics has opened new.avenues for leveraging inertial focusing to analyze small fluid volumes,thereby advancing research across chemical,physical,and biological *** traditional straight microchannels rely solely on inertial lift forces,the novel spiral geometry generates Dean drag forces,eliminating the necessity for external fields in fluid ***,fabricating 3D spiral microfluidics remains a labor-intensive and costly endeavor,hindering its w.despread ***,conventional lithographic methods primarily yield 2D planar devices,thereby limiting the selection of materials and geometrical *** address these challenges,this w.rk introduces a streamlined fabrication method for 3D spiral microfluidic devices,employing rotational force w.thin a miniaturized thermal draw.ng process,termed as *** innovation allow. for rapid prototyping of tw.sted fiber-based microfluidics featuring versatility in material selection and heightened geometric *** validate the performance of these devices,w. combined computational modeling w.th microtomographic particle image velocimetry(uTPiM)to comprehensively characterize the 3D flow.*** results corroborate the presence of a steady secondary flow.underscoring the effectiveness of our *** 3D spiral microfluidics platform paves the w.y for exploring intricate microflow.dynamics,w.th promising applications in areas such as drug delivery,diagnostics,and lab-on-a-chip systems.

关键词： thereby straight tw.sted

Emerging direct current triboelectric nanogenerator for high-entropy mechanical energy harvesting

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Science China(Technological Sciences) 2024年第5期67卷 1297-1316页

作者： CHEN Jie guo RuiLong guo HengYu College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 401331China Department of Applied Physics Chongqing UniversityChongqing 401331China

In the era of the Internet of Things(IoT),the provision of sustainable pow.r to distributed,mobile,and low.pow.r-consumption electronic devices is a critical *** overcome this challenge,the triboelectric nanogenerator(TENG),a highly efficient high-entropy mechanical energy harvesting device,w.s developed in *** device enables the direct conversion of irregular and low.frequency mechanical energy into pulsed alternating current(AC)***,the incompatibility of most electronic devices w.th AC signals necessitates rectifier circuits or generators that deliver direct current(DC)*** recent years,DC-TENGs have undergone extensive development,achieving significant milestones in various application fields w.ile also facing crucial challenges that require *** this review.three categories of DC-TENG devices w.th distinct operating mechanisms are comprehensively explored:multiphase coupling,mechanical rectification,and air *** typical structures and w.rking mechanisms are thoroughly discussed,and specific output performance limitations,along w.th corresponding optimization strategies,are ***,the applications of DC-TENGs in various scenarios are ***,the challenges faced by DC-TENGs and potential solutions are analyzed to guide further advancements in this technology.

关键词： TENG direct current w.rking mechanisms output performance limitations optimization strategies

Recent advances in the magnetic reconnection, dipolarization, and auroral processes at giant planets from the perspective of comparative planetology

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Earth and Planetary Physics 2024年第5期8卷 659-672页

作者： ZhongHua Yao RuiLong guo Yong w.i Bertrand Bonfond Denis Grodent BinZheng Zhang william R.Dunn ZuYin Pu Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Laboratoire de Physique Atmosphérique et Planétaire STAR InstituteUniversitéde Liège Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong University Department of Earth Sciences the University of Hong Kong Department of Physics and Astronomy University College London School of Earth and Space Sciences Peking University

Magnetic reconnection and dipolarization are crucial processes driving magnetospheric dynamics, including particle energization, mass circulation, and auroral processes, among others. Recent studies have revealed that these processes at Saturn and Jupiter are fundamentally different from the ones at Earth. The reconnection and dipolarization processes are far more important than previously expected in the dayside magnetodisc of Saturn and potentially Jupiter. Dayside magnetodisc reconnection w.s directly identified by using Cassini measurements(guo RL et al., 2018b) and w.s found to be drizzle-like and rotating in the magnetosphere of Saturn(Delamere et al., 2015b; Yao ZH et al., 2017a; guo RL et al., 2019). Moreover, magnetic dipolarization could also exist at Saturn's dayside(Yao ZH et al., 2018), w.ich is fundamentally different from the terrestrial situation. These new.results significantly improve our understanding of giant planetary magnetospheric dynamics and provide key insights revealing the physics of planetary aurorae. Here, w. briefly review.these recent advances and their potential implications for future investigations.

关键词： magnetosphere magnetic reconnection magnetic depolarization

Physicochemical principles of hydrogen metallurgy in blast furnace

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Journal of Iron and Steel Research International 2024年第1期31卷 46-63页

作者： Han-jie guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials Beijing100083China

Based on the stoichiometric method and the free energy minimization method,an ideal model for the reduction of iron oxides by carbon and hydrogen under blast furnace conditions w.s established,and the reduction efficiency and theoretical energy consumption of the all-carbon blast furnace and the hydrogen-rich blast furnace w.re *** results show.that after the reduction reaction is completed at the bottom of the blast furnace,the gas produced by reduction at 1600℃still has a certain excessive reduction capacity,w.ich is due to the hydrogen brought in by the hydrogen-rich blast as w.ll as the excess carbon monoxide generated by the reaction of the coke and the oxygen brought in by the *** the process of the gas w.th excessive reduction capacity rising from the bottom of the blast furnace and gas reduction process,the excessive reduction capacity of the gas gradually decreases w.th the increase in the dydrogen content in the *** the all-carbon blast furnace,the excess gas reduction capacity is the strongest,and the total energy consumption per ton of iron reduction is the *** show. that,for the current operation mode of the blast furnace,adding hydrogen in the blast furnace cannot reduce the consumption of carbon required for reduction per ton of iron,but rather increases the consumption of carbon.

关键词： Hydrogen metallurgy Excess gas reduction capacity Theoretical energy consumption Hydrogen-rich blast furnace Thermodynamic model Gibbs minimum free energy method